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Sizing the charge controllers in PV off-grid systems:

Do not exceed the controller allowed max current and voltage A/V defined as Isc/Voc.
In PWM controller max allowed voltage results from battery.min.voltage +30V (eg in 12Vdc systems: ~10Vmin.bat + 30V = 40V max).
In MPPT controller the absolute max allowed voltage is defined in the datasheet.
The real occuring current and voltage of the panel depends on temperature coefficient of the panel. Calculate additional 25% (A/V) which may occur under low temperature, as safety buffer (eg if panel Isc 8A, calculate +25% = 10A which may occur).
To choose the correct battery capacity, multiply the controller nominal current x10 (eg for an 10A controller choose 100Ah battery).
Always check the controller's datasheet and manual for individual parameters.

Diagrams Guide PV Off-Grid Systems

CIS (Waterproof IP68 Controllers)

Phocos CIS-N-20

System Voltage: 12/24V
Charge current: 20A
Max. Input Voltage: 30/50V
Max. Input Power: 350/700W
Low voltage disconnect: yes
Grounding: common negative
Charging method: PWM

Availability: in stock

Limitations: no limit

€ 69.00

Net Price (without VAT)

pcs.

Phocos CIS-N-LED-1050

System Voltage: 12/24V
Charge current: 20A
Max. Input Voltage: 30/50V
Max. Input Power: 350/700W
Low voltage disconnect: yes
Grounding: common negative
Charging method: PWM

Availability: in stock

Limitations: no limit

€ 99.00

Net Price (without VAT)

pcs.

Phocos CIS-N-MPPT 85/15

System Voltage: 12/24V
Charge current: 15A
Max. Input Voltage: 85Voc
Max. Input Power: 250/500W
Low voltage disconnect: yes
Grounding: common negative
Charging method: MPPT

Availability: in stock

Limitations: no limit

€ 112.33

Net Price (without VAT)

pcs.

Phocos CIS-N-MPPT-LED

12/24V PV solar/battery systems
Charge current: 15A
Max input voltage: 85Voc
Max input power: 250/500W
Low voltage disconnect: yes
Grounding: positive
Charging method: MPPT

Availability: in stock

Limitations: no limit

€ 140.35

Net Price (without VAT)

pcs.